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uses isotopes carbon dating-84

-14 is continually formed in nature by the interaction of neutrons with nitrogen-14 in the Earth’s atmosphere; the neutrons required for this reaction are produced by cosmic rays interacting with the atmosphere.

Radiocarbon present in molecules of atmospheric : it is absorbed from the air by green plants and then passed on to animals through the food chain.

Carbon-14 is an unstable isotope of carbon that will eventually decay at a known rate to become carbon-12.

Cosmic rays – high energy particles from beyond the solar system – bombard Earth’s upper atmosphere continually, in the process creating the unstable carbon-14. Because it’s unstable, carbon-14 will eventually decay back to carbon-12 isotopes.

It can be used on objects as old as about 62,000 years.